Driving Progress: GDOT I-75/I-575 Northwest Corridor Project by Willmer Engineering

This project for the Georgia Department of Transportation (GDOT) was planned to be a $1.0 billion public-private partnership project (P3) that would add reversible express toll lanes (ETL) along I-75 and I-575 (Northwest Corridor) north of Atlanta, relieving traffic congestion caused by over 330,000 vehicles traveling these routes per day.

Georgia Transportation Partners (GTP), led by Bechtel and Kiewit, submitted an unsolicited proposal to GDOT under new legislation encouraging the private sector to bring forward innovative project financing and delivery methods. Following a development phase involving preliminary engineering, development, and financing, the project will become a design-build effort. The project includes 27 lane miles of ETLs.

Willmer Engineering, the geotechnical engineering subconsultant to Atkins on the GTP team, provided geotechnical exploration and detailed design recommendation reports in accordance with GDOT criteria for 27 lane miles, 50 bridges (new or widened), 10 miles of MSE walls, NDT testing for several miles of transition pavement and pavement evaluations for 10 miles of I-575.

Willmer also provided design review for GDOT of all geotechnical reports for final design provided by the Northwest Corridor Builders Design/Build Team as well as RFIs during construction.


Cherokee and Cobb Counties, Georgia


Transportation Infrastructure


Geotechnical Engineering
Soil Surveys
Bridge Foundation Investigations
Wall Foundation Investigations
Pavement Evaluations
Final Design Reviews



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